The Mares Quad is a full air-integrated multi-gas dive computer (optional transmitter) featuring a large, clear display with jumbo-sized digits. The unit can receive data from a gas integration tank for up to three transmitters (transmitter not included). The transmitter features a color LED that alerts buddies of low air during a dive. The receiver (wrist unit) features a three-row layout including tank pressure and customizable fields for additional information. It has four buttons for an intuitive user interface, with a reversed button function during a dive. Option to display dive time including seconds. It has a deco-harb alarm. A dive profile with user-adjustable surface interval. User-replaceable battery with long battery life. Features: Super-clear display with jumbo size information Tank pressure integration for up to three transmitters (not included) Three-row layout consists of all relevant data including tank pressure Two customizable fields for additional information Four buttons for an intuitive user interface Reversed button function during a dive Option to display dive time including seconds Deco-harb alarm Multi-gas capable Dive profile with user-adjustable surface interval Long battery life, user replaceable Color LED for quick tank check on the surface Color LED alerts buddies of low air during a dive Permanent pairing EN250:2014 certified to 300 bar Battery type: Cr123A, user replaceable Note: Battery change required